Ten Key Calculator
This 10-key calculator works like a desktop adding machine used in accounting: type an amount and press + (or Enter) to add it, − to subtract. Every entry goes on the tape with a running total, and you can print or copy the tape.
Your tape will appear here.
Total 0.00
Worked example
Example: totaling three receipts
- Type 24.99 and press +
- Type 103.50 and press +
- Type 12.25 and press −
- The total shows 116.24
Total 116.24 with a three-line tape.
Formula
Total = Σ entries (with sign)
Amounts are added with exact cent arithmetic so the total never shows floating-point errors like 0.30000000004.
Frequently asked questions
What is a ten key calculator?
A calculator or adding machine operated with the 10 digit keys of a numeric keypad, used for fast data entry in accounting and bookkeeping.
What is a good 10-key speed?
Employers often look for 8,000–12,000 keystrokes per hour (KPH) with high accuracy.
Does it work with my keyboard's numpad?
Yes — use the numpad digits, + and −, Enter to add, Backspace to fix a typo and Esc to clear the entry.
Last reviewed October 17, 2026 · Calculations run in your browser; nothing you enter is sent to a server.